Review found Task 8's prescribed test never mounts PageProvider, so it
never exercises loadState -- deleting the repairOrphanNodes call would
still leave that suite green. Adds a PageProvider-mounted test driving
switchPage into a page with a stored orphaned node, asserting on what
loadState hands to actions.deserialize and that console.warn fires.
Verified load-bearing: temporarily neutering the repair call fails the
new test (ROOT.nodes missing 'stray'), then restored.
Also documents the fallback-branch invariant that `fallback` must
always be a known-safe constant, per review.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
shadowdaoandClaude Opus 5
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